US5120212A - Thickness-adjusting system for tubing extruder - Google Patents

Thickness-adjusting system for tubing extruder Download PDF

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Publication number
US5120212A
US5120212A US07/605,830 US60583090A US5120212A US 5120212 A US5120212 A US 5120212A US 60583090 A US60583090 A US 60583090A US 5120212 A US5120212 A US 5120212A
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US
United States
Prior art keywords
extruder
tube
housing
screws
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/605,830
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English (en)
Inventor
Erwin Reiber
Wolfgang Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Klimasysteme GmbH
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to KRAUSS-MAFFEI AKTIENGESELLSCHAFT, A CORP. OF GERMANY reassignment KRAUSS-MAFFEI AKTIENGESELLSCHAFT, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REIBER, ERWIN, WALTER, WOLFGANG
Application granted granted Critical
Publication of US5120212A publication Critical patent/US5120212A/en
Assigned to VALEO KLIMASYSTEME GMBH reassignment VALEO KLIMASYSTEME GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIEMENS AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92428—Calibration, after-treatment, or cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92571—Position, e.g. linear or angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Definitions

  • the present invention relates to a tubing extruder. More particularly this invention concerns a system for adjusting the wall thickness of tubing produced in an extruder.
  • a standard tubing extruder has a nozzle forming an annular and normally circular outlet passage.
  • the inner wall of this passage is defined by a normally solid mandrel and the outer wall is defined at least at its downstream end by an adjustment sleeve.
  • This sleeve is radially deformable or shiftable and is braced by a plurality of radially extending and angularly equispaced adjustment screws against a massive outside holding ring.
  • German utility models 8,526,188 and 8,701,877 have been suggested in German utility models 8,526,188 and 8,701,877 as well as in German patent documents 2,113,054 and 3,512,097 respectively of K. Schwarze and M. Loozenski to provide an extruder head with a sleeve having a plurality of angularly spaced actuators taking the place of the prior-art screws.
  • German utility model 8,704,664 shows an arrangement having a complex fitting replacing the downstream end of the extruder. All these systems require that the extruder be largely rebuilt in order to eliminate the manual part of the adjustment operation.
  • Other systems such as described in German patent document 3,304,865 of E. Schwab et al rely on more complex control arrangements also not adaptable to existing equipment.
  • Another object is the provision of such an improved system for adjusting the gap of a tube extruder which overcomes the above-given disadvantages, that is which can be used on an existing manual-adjustment extruder.
  • a further object is to provide such an improved adjustment system.
  • the instant invention is used in combination with an extruder having a housing, a core centered on an axis, and a sleeve spacedly coaxially surrounding the core and defining therewith an outlet passage.
  • an extruder having a housing, a core centered on an axis, and a sleeve spacedly coaxially surrounding the core and defining therewith an outlet passage.
  • molten material emerges from the passage as a tube.
  • a plurality of radially extending and angularly spaced adjustment screws are threaded into the housing and radially engage the sleeve so that these screws can be screwed in and out to radially displace the sleeve on the housing and thereby adjust the passage.
  • a detecting unit axially downstream of the extruder includes at least one sensor for measuring the thickness of the tube at a plurality of angularly spaced locations and for producing an output corresponding to the respective measured thickness.
  • An adjustment unit including at least one rotary tool engageable with the screws can selectively rotate same and screw same in the housing.
  • a controller is connected between the detecting and adjuster for rotating a screw out when the sensor output for the respective portion of the tube indicates same is too thin and for screwing a screw in when the sensor output for the respective portion of the tube indicates same too thick.
  • the system of this invention can be retrofitted on an existing manual-adjust extruder to provide it with totally automatic and sensitive adjustment of tube thickness. There is no need to fit the extruder with an expensive ne head; instead the adjustment rig is just attached over the existing adjustment screws.
  • the adjuster includes an annular guide carried on the housing centered on the axis adjacent the screws, a carriage angularly displaceable around the guide and carrying the tool, and a positioner for displacing the carriage angularly around the guide and placing the tool in positions in line with the respective screws.
  • the carriage includes a ring centered on the guide and rotatable thereon about the axis and the ring is formed with teeth and the positioner includes a motor carrying a gear meshing with the teeth.
  • the tool itself includes means for radially displacing itself relative to the carriage.
  • each tool can be angularly fixed and in constant mesh with the respective screw so that it need not be radially advanced and retracted.
  • the detector includes an array of such sensors angularly equispaced about the tube and the sensors are ultrasonic detectors. Means is provided for maintaining a body of liquid in contact between the sensors and the tube for transmitting the sound waves. What is more the detecting system can be moved oscillatingly around the axis.
  • an extruder has a central mandrel 5 and an outer sleeve 9 respectively mounted on a carrier 7 and a housing 11 and together forming a circularly annular outlet orifice or passage 1 centered on an axis A.
  • the sleeve 9 is somewhat elastically deformable or movable to move its center and change the radial dimension of this passage 1 and, thereby, locally change the radial thickness of a tube shown in dashed lines at 3 that is extruded from this passage 1.
  • the rear end of the sleeve 9 has a radially outwardly projecting annular flange 9a that fits within a mounting ring 15 centered on the axis A and secured by axially extending bolts 19 to the housing 11.
  • Another ring 13 is pressed by bolts 21 threaded into the ring 15 against the axial front face of the flange 9a to hold this ring 13 axially in place on the housing 11.
  • Eight radially extending and angularly equispaced allen-type adjustment screws 17 are threaded through the ring 15 and radially engage the sleeve 9 at its flange 9a. These screws 17 can be tightened or loosened to adjust the cross-sectional shape and/or radial position of the sleeve 9. They are a standard feature of a typical prior-art extruder and are intended for manual adjustment of the passage size.
  • the tube 3 emerges from the nozzle passage 1 into a cooling sleeve 41 that receives a coolant liquid at an inlet 43 so it can flow along passages 44.
  • This sleeve 41 is held in a vacuum chamber so that the tube 3 swells outward and presses itself against its inner wall.
  • the tube 3 hardens to an outside diameter accurately determined by the inside diameter of the sleeve 41.
  • the tube 3 enters further such calibrating sleeves after exiting the illustrated sleeve, or at least passes through further cooling/curing stages.
  • an inner bearing or guide ring 23 is bolted to the mounting ring 15 and carries an outer carriage ring 25 in turn carrying radially projecting support brackets 33 and formed with external teeth.
  • a motor 31 fixed on the housing 11 has an output shaft 29 carrying a pinion 27 meshing with the toothed ring 25 to rotate it about the axis A on the ring 23.
  • the brackets 33 in turn carry an annular support beam 65 containing pneumatic and electric control lines 67 for a motor 35 and for an axially extensible chuck 39 carrying a radially oriented allen wrench 37 shaped to fit in the screws 17.
  • the motor 31 can position the tool 27 radially in line with one of the screws 17, then the chuck 39 can extend to fit this tool 37 to the respective screw 17, and then the motor 35 can rotate the tool 37 in either direction to screw the respective screw 17 in or out.
  • the downstream end of the cooling sleeve 41 is provided with a sensing collar 45 comprising a ring 47 mounted on the tube 41 centered on the axis A and formed with a radially inwardly open groove 55 and with eight angularly equispaced and radially extending holes 51 each housing a respective ultrasonic sensor 53.
  • the groove 55 is flanked by elastomeric seals 57 and means 58 is provided for supplying water to the groove 55.
  • the controller 61 is a microprocessor-type computer that has a preset program.
  • each of the sensors 53 is directly axially downstream of a respective one of the screws 17.
  • the controller 61 operates the motor 31 to move the tool 37 to alignment with the respective screw 17, the chuck 39 is extended, and the motor 35 is operated to rotate this screw 17 in or out, depending on which adjustment is needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
US07/605,830 1989-11-02 1990-10-30 Thickness-adjusting system for tubing extruder Expired - Fee Related US5120212A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936496A DE3936496A1 (de) 1989-11-02 1989-11-02 Zentriervorrichtung fuer einen rohrextrusionskopf
DE3936496 1989-11-02

Publications (1)

Publication Number Publication Date
US5120212A true US5120212A (en) 1992-06-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US07/605,830 Expired - Fee Related US5120212A (en) 1989-11-02 1990-10-30 Thickness-adjusting system for tubing extruder

Country Status (7)

Country Link
US (1) US5120212A (de)
EP (1) EP0429862B1 (de)
JP (1) JPH03166917A (de)
AT (1) ATE98158T1 (de)
DE (1) DE3936496A1 (de)
DK (1) DK0429862T3 (de)
ES (1) ES2046649T3 (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346379A (en) * 1991-10-17 1994-09-13 Conpro Gmbh Extruding device for extruding plastic tubing with a measuring device for measuring the wall thickness of the plastic tubing
US5346384A (en) * 1991-04-08 1994-09-13 Wilhelm Hegler Apparatus for the production of plastic pipes
US5382146A (en) * 1992-10-16 1995-01-17 Friedrich Theysohn Gmbh Control device for the mechanical thermal adjustment of the nozzle of an extruder for elongate products
US5511965A (en) * 1991-10-11 1996-04-30 Specialty Silicone Fabricators, Inc. Apparatus for extruding tubing having a variable outer diameter
US5630982A (en) * 1995-12-12 1997-05-20 Sonoco Products Company Method and apparatus for extruding plastic tubing
US5674440A (en) * 1995-05-05 1997-10-07 Graham Engineering Corporation Die head with adjustable mandrel and method
US5776519A (en) * 1997-06-06 1998-07-07 Graham Engineering Corporation Parison extrusion head with quick change die ring clamp assembly
US6257863B1 (en) 1997-10-31 2001-07-10 Industrial Thermo Polymers Limited Extruder dies with shaping means
EP1249331A2 (de) * 1998-09-22 2002-10-16 Egeplast Werner Strumann GmbH & Co. KG Vorrichtung zur Herstellung von Kunststoffrohren
EP1346814A2 (de) * 2002-03-19 2003-09-24 Greiner Extrusionstechnik GmbH Formgebungseinrichtung, insbesondere Kalibrierblende
EP1577074A1 (de) * 2004-03-17 2005-09-21 Battenfeld Extrusionstechnik GmbH Extrusionswerkzeug
US20080019212A1 (en) * 2004-09-03 2008-01-24 Peter Dietz Extruder Screw, Extruder And Shaft-Hub Connection
US20100303942A1 (en) * 2007-05-08 2010-12-02 Lupke Manfred A A Alignable Cooling Plug for Extruder
US20130334730A1 (en) * 2012-04-25 2013-12-19 Maku Ag Apparatus for producing flat-web products, and method for setting it up
US20160361857A1 (en) * 2014-03-14 2016-12-15 Kraussmaffei Berstorff Gmbh Hose extrusion head and method for producing a hose
US20180126621A1 (en) * 2016-09-21 2018-05-10 Guill Tool & Engineering, Co., Inc. Concentricity adjustment sleeve
CN112643995A (zh) * 2019-10-09 2021-04-13 戴维斯-标准有限公司 具有多维控制系统的聚合物管材成型装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106486C1 (de) * 1991-03-01 1992-09-17 Reifenhaeuser Gmbh & Co Maschinenfabrik, 5210 Troisdorf, De
DE4135339A1 (de) * 1991-10-26 1993-04-29 Conpro Gmbh Ultraschallwanddickenmessgeraet fuer in einer extrusionsanlage herzustellende rohre, profile, baender und kabelummantelungen
DE4203755C2 (de) * 1992-02-10 1995-04-20 Reifenhaeuser Masch Verfahren zum Regeln der einzelnen Schichtdicken einer koextrudierten mehrschichtigen Kunststoffbahn
US5388976A (en) * 1992-02-27 1995-02-14 Friedrich Theyson Gmbh Wall thickness measuring device with calibration device
DE4221920C2 (de) * 1992-02-27 1994-07-07 Theysohn Friedrich Fa Wanddickenmeßvorrichtung mit Kalibriervorrichtung
DE4243285A1 (de) * 1992-12-21 1994-06-23 Hofmann Hans Juergen Vorrichtung zur Zentrierung von Extrusionswerkzeugen
DE102021119460B3 (de) * 2021-07-27 2022-09-08 Max Feuerherm Düsenwerkzeugsystem und Extrusionsblasanordnung

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US3923439A (en) * 1972-10-10 1975-12-02 Western Electric Co System for controlling the eccentricity of an extruded article
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Cited By (29)

* Cited by examiner, † Cited by third party
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US5346384A (en) * 1991-04-08 1994-09-13 Wilhelm Hegler Apparatus for the production of plastic pipes
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Also Published As

Publication number Publication date
JPH03166917A (ja) 1991-07-18
EP0429862A1 (de) 1991-06-05
ATE98158T1 (de) 1993-12-15
DK0429862T3 (da) 1994-04-18
ES2046649T3 (es) 1994-02-01
DE3936496A1 (de) 1991-05-08
EP0429862B1 (de) 1993-12-08
DE3936496C2 (de) 1992-04-23

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